Concept:Inhalation is the process of drawing air into the lungs by expanding the chest cavity.
Explanation:During inhalation, the rib muscles contract and pull the ribs upward and outward.
This movement increases the volume of the thoracic cavity.
The increased volume lowers the pressure inside the lungs compared to the outside air.
Air then moves into the lungs to balance the pressure.
Processes such as ribs moving downward and inward, or a decrease in chest volume, belong to exhalation.
Hence, only the events that expand the chest cavity are linked to inhalation.
Answer:A. I and III only